Entoloma sinuatum (Entoloma lividum or Rhodophyllus sinuatus), known as the Livid Pinkgill, are large and highly poisonous mushrooms, widespread across Europe and North America, which appear in late summer and autumn in deciduous woodlands on chalky or clay soils, under oak, beech, and less commonly birch. Entoloma sinuatum causes primarily highly unpleasant gastrointestinal problems, in some cases ending in death. They resemble members of the genus Tricholoma and look like some popular edible species. When they are young, an inexperienced gatherer of mushrooms can confuse them with the edible Agaricus mushrooms or Clitopilus prunulus, the Miller, or perhaps even with the highly-prized St. George's mushroom (Calocybe gambosa).